I think it's hard to absolutely assess the value of a student loan —however predatory— without considering the prospects of having a higher education. Some degrees are worth a dodgy loan. Some really aren't.
You could also say that many students wouldn't be in higher education without the loan. That is especially true here in the UK. That might not be a bad thing except that we've gone through an arms race so that every junior post needs five bachelor degrees and a decade of experience. Experience alone used to be enough.
It'd be nice to get back there. Our focus on getting everybody into higher education —and underwriting indefinite liens on lifetime income— has also meant that universities care more about the number of students than the quality of teaching. That alone probably isn't news, what has been recently in the UK is the remuneration of higher management staff.
They can apparently justify the 10-20× bump over senior lecturers (plus benefits like housing, cars, lunches) to their boards by saying they're the only people who can attract all the money from the students. It's disgusting and vicious cycle.